If you are retired, you do not have a source of income from a job--you rely on your savings, interest from investments, or the government (e.g., social security in the US). With a job, your salary typically increases every so often to track inflation. When you just have savings, the total value of your money stays the same while the purchasing power of that money decreases. Investment income on your savings (e.g., interest) counterbalances this effect somewhat and government programs typically give out more money to account for the effects of inflation, but neither of these counterbalancing measures may prove sufficient.
The Congressional power is known as the Supremacy clause.
In Article 6 Clause 2 of the United States Constitution, it states that federal laws are the supreme laws of the land. This means federal laws trump all other laws in the United States. So if the federal government wants to prosecute people for the possession of marijuana in a state where it is legal, they can legally do so thanks to the supremacy clause.
cost of the Journey is the correct answer.
Many settlers migrated from Europe who were called western settlers. They face many obstacles which encountered on the waterways as well as during their settlement. The cost of journey was not an obstacle for them as it was very easy and convenient for them.